获取按钮名称 [英] Getting the Button name

问题描述

嘿，朋友们，我在处理按钮时有疑问.我想在actionPerformed()方法中使用按钮的名称.以下是将更清楚地描述我的问题的代码.

hey frnds I am having a doubt in handling the buttons. I want to use the name of the button in the actionPerformed() method. Following is the code which will describe my question more clearly.

class myframe extends JFrame implements ActionListener
{
      //ArrayList <jbutton> blist;
	private static final long serialVersionUID = 1L;
	//private static final String EXIT_ON_CLOSE = null;
	int i=0,j=0;
	int flag[];
      JButton b[][]=new JButton[4][4];
      myframe()
      {
         super("Queens Problem");
         //b[] =new JButton[16];
         Image img=getToolkit().createImage("images/queen.jpg");
         ImageIcon imgicn=new ImageIcon(img);
         try
         {
            for(i=0;i<4;i++)
             {
        		 for(j=0;j<4;j++)
        		 {
        			 b[i][j]=new JButton();
        			 b[i][j].setIcon(imgicn);
        			 add(b[i][j]);
        			 b[i][j].addActionListener(this);
        		 }
             }
         }
         catch(Exception e)
         {
        	 System.out.println("Error:"+e.getMessage());
         }
        setLayout(new GridLayout(4,4));
         setSize(500,500);
         setVisible(true);
      // setDefaultCloseOperation(EXIT_ON_CLOSE);
         
      }
      public void actionPerformed(ActionEvent a)
      {
    	  //setBackground(Color.BLUE);
    	  //UIManager.put("Button.background", Color.red);
    	  JButton button = (JButton) a.getSource();
    	  button.setBackground(Color.red);
    	  //a.getComponent().setBackground(Color.red);
           
      }
}

在上面的actionPerformed方法中，我想获取被单击的按钮的名称(即b [i] [j])，以便可以对该按钮执行操作.如何避免使用getSource()?
提出一些建议.谢谢.

In the actionPerformed method above, i want to get the name of the button(ie b[i][j]) whichever is clicked so that i can perform operations on that button.How can i avoid the use of getSource()?
Give some suggestions. Thanks.

推荐答案

您应该使用getSource();.您还应该首先使用instanceof:
检查从该函数给出的对象是否真的是一个Button.

You should use getSource();. You should also check first if the object, that''s given from that function is really a Button by using instanceof:

if(a instanceof JButton){
    JButton button = (JButton) a.getSource();
    if(button.getText() == "Funny button"){
        button.setBackground(Color.red);
    }
}

鉴于每个按钮都有不同的文本，因此您可以随时识别组件.
只要您只有几个控件，此方法就起作用.否则
我建议根据您的需求自定义组件:

This way you''re able to identify your components at any time - given that every button has a different text.
This works as long as you only have a few controls. Otherwise
I recommend to customize the components for your needs:

public class MyButton extends JButton {
  private final String strButtonID;

  public MyButton(String strButtonText, String strButtonID){
      super(strButtonText);
      this.strButtonID = strButtonID;
      
  }

  public String getID(){
      return strButtonID;
  }

}

如果您还对ID使用定义了静态字符串的接口，即使两个按钮具有相同的文本，您也可以节省:

If you then also use a Interface with defined static Strings for the IDs you''re pretty save even when 2 button have the same text:

public interface IComponentID{

    public static final String BUTTONID = "FunnyButton";

}

然后，您只需要这样做:

You then only need to do it like this:

MyButton oButton = new MyButton("Buttontext", IComponentID.BUTTONID);
....

if(a instanceof MyButton){
    MyButton button = (MyButton) a.getSource();
    if(button.getID() == IComponentID.BUTTONID){
        button.setBackground(Color.red);
    }
}

并且-现在我们已经走了很长一段路-我建议不仅设置一个字符串来标识按钮，而且还建议使用ComponentID(String ID，String Buttontext).
但我认为您可以开发;-)

AND - now that we''ve come this long way - I would recommend to not just set an String to identify the button but a ComponentID(String ID, String Buttontext).
But I assume you''re able to develop that ;-)

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